안녕하세요 교수님 main함수안에 const int num_students = 5; 쓰고 시작하는데  이 뜻이 메모리 5개 빌릴거야 하는  뜻의 array 맞나요? 그리고 for문안에 들어가는 total_score += score[i] ; 의 의미가 헷갈리는데 설명해주시면 정말 도움이될것 같아요 감사합니다 

삭제된 글입니다

https://github.com/pulmuone/CustomAdapter adapter부분을 viewBinding으로 해봤습니다. rowView.run {} 이 기능(?)은 vb.net 에서 봤는데 코틀린이 단순화 하려고 많이 노력했네요.

와.. 이번 length 프로퍼티가 어떻게 생성되는지 내부적으로 어떤 구조를 통해서 length를 불러오는지 알게되서 너무 기쁘고 신기합니다. 평소에 아무 생각없이 사용하던 빌트인 함수였을 뿐인데 내부적으로 이런 루트를 통해서 호출하고 있던 거였군요.. 명강의 정말 감사합니다!! ( _ _ )bb

안녕하세요  좀헷갈리는 부분이있습니다. WebSecurityConfigurerAdapter에서는 config 메소드에 순차적으로 인증을 확인하는데 이때 Role 부분이 UserDetails가 맞죠?  로그인을하고 그게맞다면 UserDetails가 반환되며 그 반환된 것은 Entity에 UserDetails를 상속한것이구요. 그럼 순서가 그렇게 반환되어서 authentication Manager까지 올라가고 cofing 메소드가 호출되어 그 Userdetails의 Role을 확인하면서 인가를 하는것인가요? 즉, config 메소드가 어느시점에 호출되는지와 그 호출되었으면 Userdetails를 상속한 클래스를 대상으로 인증을하는건지 궁금합니다. 강의잘보고있습니다 감사합니다.

본 강의에서 프로젝트 모듈 중에 'Xxx-Spring-Boot-Autoconfigure 모듈: 자동 설정, Xxx-Spring-Boot-Starter 모듈: 필요한 의존성 정의' 에 대해 가볍게 넘어가셨는데, 본 강의에서 실습한 프로젝트 중 spring.factories 파일을 설정한 Xxx-Spring-Boot-Starter 프로젝트는 저 둘 중에 어디에 해당하는 건가요?? ~Starter 모듈과 ~Autoconfigure 모듈의 상세한 차이점을 알고 싶습니다!

Boiler Plate 깔고 npm install 시  아래와 같은 오류가  납니다 ㅠㅠ 원인이 무엇일까요? PS E:\node_\boilerplate-mern-stack-master> npm install > bcrypt@3.0.8 install E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt > node-pre-gyp install --fallback-to-build node-pre-gyp WARN Using needle for node-pre-gyp https download  node-pre-gyp WARN Tried to download(404): https://github.com/kelektiv/node.bcrypt.js/releases/download/v3.0.8/bcrypt_lib-v3.0.8-node-v83-win32-x64-unknown.tar.gz  node-pre-gyp WARN Pre-built binaries not found for bcrypt@3.0.8 and node@14.15.0 (node-v83 ABI, unknown) (falling back to source compile with node-gyp)  gyp ERR! find Python  gyp ERR! find Python Python is not set from command line or npm configuration gyp ERR! find Python Python is not set from environment variable PYTHON gyp ERR! find Python checking if "python" can be used gyp ERR! find Python - "python" is not in PATH or produced an error gyp ERR! find Python checking if "python2" can be used gyp ERR! find Python - "python2" is not in PATH or produced an error gyp ERR! find Python checking if "python3" can be used gyp ERR! find Python - "python3" is not in PATH or produced an error gyp ERR! find Python checking if the py launcher can be used to find Python 2 gyp ERR! find Python - "py.exe" is not in PATH or produced an error gyp ERR! find Python checking if Python is C:\Python27\python.exe gyp ERR! find Python - "C:\Python27\python.exe" could not be run gyp ERR! find Python checking if Python is C:\Python37\python.exe gyp ERR! find Python - "C:\Python37\python.exe" could not be run gyp ERR! find Python gyp ERR! find Python ********************************************************** gyp ERR! find Python You need to install the latest version of Python. gyp ERR! find Python Node-gyp should be able to find and use Python. If not, gyp ERR! find Python you can try one of the following options: gyp ERR! find Python - Use the switch --python="C:\Path\To\python.exe" gyp ERR! find Python   (accepted by both node-gyp and npm) gyp ERR! find Python - Set the environment variable PYTHON gyp ERR! find Python - Set the npm configuration variable python: gyp ERR! find Python   npm config set python "C:\Path\To\python.exe" gyp ERR! find Python For more information consult the documentation at: gyp ERR! find Python https://github.com/nodejs/node-gyp#installation gyp ERR! find Python ********************************************************** gyp ERR! find Python gyp ERR! configure error gyp ERR! stack Error: Could not find any Python installation to use gyp ERR! stack     at PythonFinder.fail (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\find-python.js:307:47) gyp ERR! stack     at PythonFinder.runChecks (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\find-python.js:136:21) gyp ERR! stack     at PythonFinder.<anonymous> (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\find-python.js:225:16) gyp ERR! stack     at PythonFinder.execFileCallback (C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\lib\find-python.js:271:16) gyp ERR! stack     at exithandler (child_process.js:315:5) gyp ERR! stack     at ChildProcess.errorhandler (child_process.js:327:5) gyp ERR! stack     at ChildProcess.emit (events.js:315:20) gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12) gyp ERR! stack     at onErrorNT (internal/child_process.js:465:16) gyp ERR! stack     at processTicksAndRejections (internal/process/task_queues.js:80:21) gyp ERR! System Windows_NT 10.0.18363 gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modules\\node-gyp\\bin\\node-gyp.js" "configure" "--fallback-to-build" "--module=E:\\node_\\boilerplate-mern-stack-master\\node_modules\\bcrypt\\lib\\binding\\bcrypt_lib.node" "--module_name=bcrypt_lib" "--module_path=E:\\node_\\boilerplate-mern-stack-master\\node_modules\\bcrypt\\lib\\binding" "--napi_version=7" "--node_abi_napi=napi" "--napi_build_version=0" "--node_napi_label=node-v83" gyp ERR! cwd E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt gyp ERR! node -v v14.15.0 gyp ERR! node-gyp -v v5.1.0 gyp ERR! not ok node-pre-gyp ERR! build error  node-pre-gyp ERR! stack Error: Failed to execute 'C:\Program Files\nodejs\node.exe C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js configure --fallback-to-build --module=E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt\lib\binding\bcrypt_lib.node --module_name=bcrypt_lib --module_path=E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt\lib\binding --napi_version=7 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v83' (1) node-pre-gyp ERR! stack     at ChildProcess.<anonymous> (E:\node_\boilerplate-mern-stack-master\node_modules\node-pre-gyp\lib\util\compile.js:83:29) node-pre-gyp ERR! stack     at ChildProcess.emit (events.js:315:20) node-pre-gyp ERR! stack     at maybeClose (internal/child_process.js:1048:16) node-pre-gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:288:5) node-pre-gyp ERR! System Windows_NT 10.0.18363 node-pre-gyp ERR! command "C:\\Program Files\\nodejs\\node.exe" "E:\\node_\\boilerplate-mern-stack-master\\node_modules\\node-pre-gyp\\bin\\node-pre-gyp" "install" "--fallback-to-build" node-pre-gyp ERR! cwd E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt node-pre-gyp ERR! node -v v14.15.0 node-pre-gyp ERR! node-pre-gyp -v v0.14.0 node-pre-gyp ERR! not ok Failed to execute 'C:\Program Files\nodejs\node.exe C:\Program Files\nodejs\node_modules\npm\node_modules\node-gyp\bin\node-gyp.js configure --fallback-to-build --module=E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt\lib\binding\bcrypt_lib.node --module_name=bcrypt_lib --module_path=E:\node_\boilerplate-mern-stack-master\node_modules\bcrypt\lib\binding --napi_version=7 --node_abi_napi=napi --napi_build_version=0 --node_napi_label=node-v83' (1) npm WARN react-redux@5.1.2 requires a peer of react@^0.14.0 || ^15.0.0-0 || ^16.0.0-0 but none is installed. You must install peer dependencies yourself. npm WARN react-redux@5.1.2 requires a peer of redux@^2.0.0 || ^3.0.0 || ^4.0.0-0 but none is installed. You must install peer dependencies yourself. npm WARN react-boiler-plate@1.0.0 No repository field. npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.12 (node_modules\fsevents): npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.12: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"x64"}) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! bcrypt@3.0.8 install: `node-pre-gyp install --fallback-to-build` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the bcrypt@3.0.8 install script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR!     C:\Users\cdg\AppData\Roaming\npm-cache\_logs\2020-12-06T16_48_01_155Z-debug.log

11:04 객체 attribute값을 바꾸기 위해  quad1.height=10 quad1.width=10 등으로 객체 호출하셨지요. 그런데 string.split()처럼 객체 이름. method이름(인자)가 공식 아닌가요?? 그러면 quad1. quad_name() 이어야 할 것 같은데, 왜 메서드 (quad_name) 대신 인자(height, width)가 들어갔는지 궁금합니다.

def tot_length1(word: str, num: int) -> int: def tot_length2(word: str, num: int) -> None: 여기서 맨우측 int와 none의 차이는 무엇인가요?? 또한 word:str, num:int라고 선언한 것은 word에 들어가는 인자는 str값이라는 것을 확인해줌으로 써 혹시나 하는 형 변환을 방지시켜주는 역할을 하는 것인가요??

안녕하세요 선생님, 꾸준하게 강의 듣고 있는데 이번 연습문제가 너무 어렵게 느껴져서 함수, input태그를 써서 조건문에서 풀었던 소수판별 프로그램 먼저 익히려고 하는데요, 77, 81같은 숫자를 입력했을 때 조건문이 먹히지가 않아서 질문 드립니다. 어떤 부분을 어떻게 수정해야 할지 모르겠는데 힌트 부탁드립니다..! <!DOCTYPE html> <html lang="ko"> <head>     <meta charset="UTF-8">     <meta name="viewport" content="width=device-width, initial-scale=1.0">     <title>소수판별 프로그램</title> </head> <body>     <h1>소수판별 프로그램입니다.</h1>      입력할 숫자 : <input type="text" id="num">     <button onclick = "display()"> 확인</button>     <script>        function display(){            var strN = document.getElementById("num").value;            var n = Number(strN);            for(i = 2; i < n; i++){                 if(n % i === 0){                     console.log(n + "은 소수가 아닙니다.");                     break;                                   }                     else{                     console.log(n + "은 소수입니다.");                 }             }         }     </script> </body> </html> 함수, 객체 부터 내용이 어려워졌는데 포기하지 않겠습니다ㅜ

선생님 안녕하세요! 강의를 듣다가 award 부분에 스크롤이 도달했을 때 opacity : 0 이었다가 opacity : 1로 스르륵 나타나게 하고싶은데 js를 모르겠어요 ㅠㅠ 혹시 알려주실 수 있으실까요?

코로나관련 게시물 프로젝트가  업데이트 예정과 강의소개에서 사라졌던데 강의계획에서 사라진것인가요?

sudo service mongod start 명령이 맥 운영체제에서 brew services start mongodb와 동일한 명령어라 생각해도 될까요? sudo service mongod start 으로 실행시키고 진행했는데 선생님의 강의대로 특별히 오류메시지가 뜨지는 않았어요. 

안녕하세요 선생님. 아래 문제 풀어보았는데 틀린이유를 도무지 모르겠어서 여쭤봅니다 알려주시면 감사하겠습니다 ㅜ 

강의에는 scrollX, oldScrollX 이렇게 파라미터가 되어 있어서 보기 편한데 최신 버전에는 아래와 같이 되서 불편합니다.  자동 생성된 파라미터를 이전 버전처럼 생성되게 할 수 있나요? val listener1 = object : View.OnScrollChangeListener { override fun onScrollChange(p0: View?, p1: Int, p2: Int, p3: Int, p4: Int) { when(p0?.id) { R.id.scroll1 -> { } } }}

main.add.js파일을 복붙해서 넣었는데 오류가 발생되어서 제 아무리 찾아봐도 어디서 오타인지를 못찾아서 도움을 요청하려고 글을 남깁니다. 오류는 콘솔로그에 Uncaught TypeError: Cannot read property 'style' of null     at playAnimation (main.js:257)     at scrollLoop (main.js:355)     at main.js:361 라고 뜹니다. 제 스스로 찾아야하는데 도움부탁드립니다. 우선 제 js코드를 올려드리겠습니다. (() => {     let yOffset = 0; //window.pageYOffset 대신 쓸 변수     let prevScrollHeight = 0; // 현재 스크롤 위치(yOffset)보다 이전에 위치한 스크롤 섹션들의 스크롤 높이값의 합     let currentScene = 0; // 현재 활성화된(눈 앞에 보고있는) 씬(scroll-section)     let enterNewScene = false; // 새로운 scene이 시작된 순간 true     const sceneInfo = [{             // 0             type: 'sticky',             heightNum: 5, // 브라우저 높이의 5배로 scrollHeight 세팅             scrollHeight: 0,             objs: {                 container: document.querySelector('#scroll-section-0'),                 messageA: document.querySelector('#scroll-section-0 .main-message.a'),                 messageB: document.querySelector('#scroll-section-0 .main-message.b'),                 messageC: document.querySelector('#scroll-section-0 .main-message.c'),                 messageD: document.querySelector('#scroll-section-0 .main-message.d')             },             values: {                 messageA_opacity_in: [0, 1, {                     start: 0.1,                     end: 0.2                 }],                 messageB_opacity_in: [0, 1, {                     start: 0.3,                     end: 0.4                 }],                 messageC_opacity_in: [0, 1, {                     start: 0.5,                     end: 0.6                 }],                 messageD_opacity_in: [0, 1, {                     start: 0.7,                     end: 0.8                 }],                 messageA_translateY_in: [20, 0, {                     start: 0.1,                     end: 0.2                 }],                 messageB_translateY_in: [20, 0, {                     start: 0.3,                     end: 0.4                 }],                 messageC_translateY_in: [20, 0, {                     start: 0.5,                     end: 0.6                 }],                 messageD_translateY_in: [20, 0, {                     start: 0.7,                     end: 0.8                 }],                 messageA_opacity_out: [1, 0, {                     start: 0.25,                     end: 0.3                 }],                 messageB_opacity_out: [1, 0, {                     start: 0.45,                     end: 0.5                 }],                 messageC_opacity_out: [1, 0, {                     start: 0.65,                     end: 0.7                 }],                 messageD_opacity_out: [1, 0, {                     start: 0.85,                     end: 0.9                 }],                 messageA_translateY_out: [0, -20, {                     start: 0.25,                     end: 0.3                 }],                 messageB_translateY_out: [0, -20, {                     start: 0.45,                     end: 0.5                 }],                 messageC_translateY_out: [0, -20, {                     start: 0.65,                     end: 0.7                 }],                 messageD_translateY_out: [0, -20, {                     start: 0.85,                     end: 0.9                 }]             }         },         {             // 1             type: 'normal',             // heightNum: 5, // type normal에서는 필요 없음             scrollHeight: 0,             objs: {                 container: document.querySelector('#scroll-section-1')             }         },         {             // 2             type: 'sticky',             heightNum: 5,             scrollHeight: 0,             objs: {                 container: document.querySelector('#scroll-section-2'),                 messageA: document.querySelector('#scroll-section-2 .a'),                 messageB: document.querySelector('#scroll-section-2 .b'),                 messageC: document.querySelector('#scroll-section-2 .c'),                 pinB: document.querySelector('#scroll-section-2 .b .pin'),                 pinC: document.querySelector('#scroll-section-2 .c .pin')             },             values: {                 messageA_translateY_in: [20, 0, {                     start: 0.15,                     end: 0.2                 }],                 messageB_translateY_in: [30, 0, {                     start: 0.6,                     end: 0.65                 }],                 messageC_translateY_in: [30, 0, {                     start: 0.87,                     end: 0.92                 }],                 messageA_opacity_in: [0, 1, {                     start: 0.25,                     end: 0.3                 }],                 messageB_opacity_in: [0, 1, {                     start: 0.6,                     end: 0.65                 }],                 messageC_opacity_in: [0, 1, {                     start: 0.87,                     end: 0.92                 }],                 messageA_translateY_out: [0, -20, {                     start: 0.4,                     end: 0.45                 }],                 messageB_translateY_out: [0, -20, {                     start: 0.68,                     end: 0.73                 }],                 messageC_translateY_out: [0, -20, {                     start: 0.95,                     end: 1                 }],                 messageA_opacity_out: [1, 0, {                     start: 0.4,                     end: 0.45                 }],                 messageB_opacity_out: [1, 0, {                     start: 0.68,                     end: 0.73                 }],                 messageC_opacity_out: [1, 0, {                     start: 0.95,                     end: 1                 }],                 pinB_scaleY: [0.5, 1, {                     start: 0.6,                     end: 0.65                 }],                 pinC_scaleY: [0.5, 1, {                     start: 0.87,                     end: 0.92                 }]             }         },         {             // 3             type: 'sticky',             heightNum: 5,             scrollHeight: 0,             objs: {                 container: document.querySelector('#scroll-section-3'),                 canvasCaption: document.querySelector('.canvas-caption')             },             values: {             }         }     ];     function setLayout() {         // 각 스크롤 섹션의 높이 세팅         for (let i = 0; i < sceneInfo.length; i++) {             if (sceneInfo[i].type === 'sticky') {                 sceneInfo[i].scrollHeight = sceneInfo[i].heightNum * window.innerHeight;             } else if (sceneInfo[i].type === 'normal') {                 sceneInfo[i].scrollHeight = sceneInfo[i].objs.container             }             sceneInfo[i].objs.container.style.height = `${sceneInfo[i].scrollHeight}px`;         }         yOffset = window.pageYOffset;         let totalScrollHeight = 0;         for (let i = 0; i < sceneInfo.length; i++) {             totalScrollHeight += sceneInfo[i].scrollHeight;             if (totalScrollHeight >= yOffset) {                 currentScene = i;                 break;             }         }         document.body.setAttribute('id', `show-scene-${currentScene}`);     }     function calcValues(values, currentYOffset) {         let rv;         //현재 씬(스크롤섹션)에서 스크롤된 범위를 비율로 구하기         const scrollHeight = sceneInfo[currentScene].scrollHeight;         const scrollRatio = currentYOffset / scrollHeight;         if (values.length === 3) {             //start ~ end 사이에 애니메이션 실행             const partScrollStart = values[2].start * scrollHeight;             const partScrollEnd = values[2].end * scrollHeight;             const partScrollHeight = partScrollEnd - partScrollStart;             if (currentYOffset >= partScrollStart && currentYOffset <= partScrollEnd) {                 rv = (currentYOffset - partScrollStart) / partScrollHeight * (values[1] - values[0]) + values[0];             } else if (currentYOffset < partScrollStart) {                 rv = values[0];             } else if (currentYOffset > partScrollEnd) {                 rv = values[1];             }         } else {             rv = scrollRatio * (values[1] - values[0]) + values[0];         }         return rv;     }     function playAnimation() {         const objs = sceneInfo[currentScene].objs;         const values = sceneInfo[currentScene].values;         const currentYOffset = yOffset - prevScrollHeight;         const scrollHeight = sceneInfo[currentScene].scrollHeight;         const scrollRatio = currentYOffset / scrollHeight;         switch (currentScene) {             case 0:                 // console.log('0 play')                 if (scrollRatio <= 0.22) {                     // in                     objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);                     objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;                 } else {                     // out                     objs.messageA.style.opacity = calcValues(values.messageA_opacity_out, currentYOffset);                     objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_out, currentYOffset)}%, 0)`;                 }                 if (scrollRatio <= 0.42) {                     // in                     objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);                     objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;                 } else {                     // out                     objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);                     objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;                 }                 if (scrollRatio <= 0.62) {                     // in                     objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);                     objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;                 } else {                     // out                     objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);                     objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;                 }                 if (scrollRatio <= 0.82) {                     // in                     objs.messageD.style.opacity = calcValues(values.messageD_opacity_in, currentYOffset);                     objs.messageD.style.transform = `translate3d(0, ${calcValues(values.messageD_translateY_in, currentYOffset)}%, 0)`;                 } else {                     // out                     objs.messageD.style.opacity = calcValues(values.messageD_opacity_out, currentYOffset);                     objs.messageD.style.transform = `translate3d(0, ${calcValues(values.messageD_translateY_out, currentYOffset)}%, 0)`;                 }                 break;             case 2:                 // console.log('2 play');                 if (scrollRatio <= 0.32) {                     // in                     objs.messageA.style.opacity = calcValues(values.messageA_opacity_in, currentYOffset);                     objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in, currentYOffset)}%, 0)`;                 } else {                     // out                     objs.messageA.style.opacity = calcValues(values.messageA_opacity_out, currentYOffset);                     objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_out, currentYOffset)}%, 0)`;                 }                 if (scrollRatio <= 0.67) {                     // in                     objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;                     objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);                     objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;                 } else {                     // out                     objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;                     objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);                     objs.pinB.style.transform = `scaleY(${calcValues(values.pinB_scaleY, currentYOffset)})`;                 }                 if (scrollRatio <= 0.93) {                     // in                     objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;                     objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);                     objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;                 } else {                     // out                     objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;                     objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);                     objs.pinC.style.transform = `scaleY(${calcValues(values.pinC_scaleY, currentYOffset)})`;                 }                 break;             case 3:                 // console.log('3 play');                 break;         }     }     function scrollLoop() {         enterNewScene = false;         prevScrollHeight = 0;         for (let i = 0; i < currentScene; i++) {             prevScrollHeight += sceneInfo[i].scrollHeight;         }         if (yOffset > prevScrollHeight + sceneInfo[currentScene].scrollHeight) {             enterNewScene = true;             currentScene++;             document.body.setAttribute('id', `show-scene-${currentScene}`);         }         if (yOffset < prevScrollHeight) {             if (currentScene === 0) return // 브라우저 바운스 효과로 인해 마이너스가 되는 것을 방지(모바일)             enterNewScene = true;             currentScene--;             document.body.setAttribute('id', `show-scene-${currentScene}`);         }         if (enterNewScene) return;         playAnimation();     }     window.addEventListener('scroll', () => {         yOffset = window.pageYOffset;         scrollLoop();     });     //window.addEventListener('DOMContentLoaded', setLayout);     window.addEventListener('load', setLayout);     window.addEventListener('resize', setLayout); })();

안녕하세요. print(a,file=b)라고 하면 파일 옵션이 a를 b에 쓴다고 설명해주셨는데 이 부분이 어떤 의미인지 잘 이해가 가지 않아서요, python file 옵션으로 검색해봐도 file open에 대한 내용이 주로 나오는데 추가적인 설명 부탁드릴 수 있을까요?

강의 코드3에서 맞는 케이스가 없으면 디폴트가 실행된다 되어있는데 디폴트 실행 후 케이스 2도 실행되는거면 왜 실행값이 700, 200이 아니라 200만 나오나요?? 디폴트 값인 700은 수행되지 않는건가요?

forEach문으로 map을 구현했는데 이게 어떤면에서 억지스러운 것인지 궁급합니다!

터미널에서  pwd 치고 그다음 cd /vqgrqnt/ 치면 디렉토리가없다고나오네요